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In interval mode (say LogMode=60min), how long does the unit search for a fix before going back to sleep, and does it write anything when it can't get one?

Under good outdoor signal conditions, the V-2000 normally obtains a fix in approximately 10–20 seconds.

If the device is in a location where a fix cannot be obtained, such as a fully enclosed indoor environment, it will continue searching for up to 3 minutes. If it still cannot obtain a fix, it will return to sleep and wait for the next scheduled interval. No track point is written when a fix is not obtained.

In the supplied one-hour interval sample, the first two records are 1 hour and 6 seconds apart, indicating that the device obtained that particular fix approximately 6 seconds after waking. This is an example rather than a guaranteed acquisition time.